i have a magnum 870 wingmaster and aside from a recent parkerizing, has functioned flawlessly since my dad purchased it in the late 60's. i have fired countless 3" magnum loads and anything else i could get in it. i now hunt with a benelli but the 870 is equipped with a choate extension and stock set and loaded with magnum buckshot at my bedside. benelli is in the safe unloaded...